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Chladniite

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Ernst Florens Friedrich Chladni
Formula:
{Ca}{Na8}{Ca4Na4}{(Mg,Fe2+)43}(PO4)36
System:
Trigonal
Colour:
Colorless
Hardness:
4½ - 5
Member of:
Name:
Named in honour of Ernst Florens Friedrich Chladni (1756-1827), University of Riga, Latvia, "father" of meteoritics.
Chemically close minerals (also anhydrous) include czochralskiite, brianite, and merrillite - all known from meteorites. Johnsomervilleite of the same group is also somewhat chemically similar.

Originally found as a single grain (975 x 175 micrometers) with chlorapatite, olivine, pyroxene, plagioclase, schreibersite, and troilite.

Just recently a terrestrial occurrence evidence was reported by Rius (2016). It is of pegmatitic origin and was determined using the relatively new technique: through-the-substrate microdiffraction (tts-μXRD). This terrestrial chladniite is different from the meteoritic one in cation(Mg, Fe+Mn & Ca) ordering, and is said to have the M(1) site dominated by Mn (the question thus arises if this is still chladniite).

Classification of Chladniite

Approved
Approval Year:
1993
8.AC.50

8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
C : With medium-sized and large cations
Dana 7th ed.:
38.2.9.3
38.2.5.3

38 : ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
2 : (AB)5(XO4)3
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Type Occurrence of Chladniite

Place of Conservation of Type Material:
Smithsonian Institute
Geological Setting of Type Material:
In type IIICD iron meteorite and primitive achondrite meteorite.

Occurrences of Chladniite

Geological Setting:
Iron and primitive achondrite meteorites

Physical Properties of Chladniite

Sub-Vitreous, Resinous
Diaphaneity (Transparency):
Transparent
Colour:
Colorless
Streak:
White
Hardness (Mohs):
4½ - 5
Tenacity:
Brittle
Cleavage:
Imperfect/Fair
Rhombohedral
Fracture:
Irregular/Uneven
Density:
3.017(2) g/cm3 (Calculated)

Crystallography of Chladniite

Crystal System:
Trigonal
Class (H-M):
3 - Rhombohedral
Space Group:
R3
Space Group Setting:
R3
Cell Parameters:
a = 14.967(2) Å, c = 42.595(4) Å
Ratio:
a:c = 1 : 2.846
Unit Cell Volume:
V 8,263.40 ų (Calculated from Unit Cell)
Z:
18
Morphology:
Rims around other phosphates and silicates
X-Ray Powder Diffraction Data:
d-spacingIntensity
3.69 (strong)
3.56 (medium)
3.08 (weak)
2.96 (strong)
2.50 (medium)
2.75 (strong)
2.13 (medium)
1.851 (medium)
Comments:
American Mineralogist 79:375 (1994)

Optical Data of Chladniite

Type:
Uniaxial (+)
RI values:
nω = 1.600 nε = 1.620
Birefringence:
0.02
Max Birefringence:
δ = 0.020
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Type:
Anisotropic
Anisotropism:
weak
Colour in reflected light:
Gray
Internal Reflections:
orange-brown
Pleochroism:
Non-pleochroic
Comments:
Weakly anisotropic

Chemical Properties of Chladniite

Formula:
{Ca}{Na8}{Ca4Na4}{(Mg,Fe2+)43}(PO4)36
Idealised Formula:
Na2CaMg7(PO4)6
All elements listed in formula:
Common Impurities:
Fe,Mn,Si

Relationship of Chladniite to other Species

Member of:
Other Members of Group:
Fillowite{Mn2+}{Na8}{Ca4Na4}{(Mn2+,Fe2+)43}(PO4)36
Galileiite{Fe2+}{Na8}{Fe42+Na4}{Fe432+}(PO4)36
JohnsomervilleiteNa10Ca6Mg18Fe25(PO4)36
Stornesite-(Y){(Y, Ca)}{Na62}{(Ca,Na)8}{(Mg,Fe2+)43}(PO4)36
XenophylliteNa4Fe72+(PO4)6
8.AC.WopmayiteCa6Na3□Mn(PO4)3(PO3OH)4
8.AC.05HowardevansiteNaCuFe2(VO4)3
8.AC.10Alluaudite(Na,Ca)Mn2+(Fe3+,Mn2+,Fe2+,Mg)2(PO4)3
8.AC.10Arseniopleite(Ca,Na)NaMn2+(Mn2+,Mg,Fe2+)2(AsO4)3
8.AC.10Caryinite(Na,Pb)(Ca,Na)CaMn22+(AsO4)3
8.AC.10Ferroalluaudite(Na,Ca)Fe2+(Fe3+,Mn2+,Fe2+)2(PO4)3
8.AC.10HagendorfiteNaCaMn2+Fe22+(PO4)3
8.AC.10JohilleriteNa(Mg,Zn)3Cu(AsO4)3
8.AC.10Maghagendorfite(□,Na,)(Na,Ca,Fe2+)Mn(Mg,Fe2+,Fe3+)3(PO4)3
8.AC.10NickenichiteNa0.8Ca0.4Cu0.4(Mg,Fe)3(AsO4)3
8.AC.10VaruliteNaCaMn2+Mn22+(PO4)3
8.AC.10FerrohagendorfiteNaCaFe2+Fe22+(PO4)3
8.AC.10BradaczekiteNaCu4(AsO4)3
8.AC.10YazganiteNaFe23+(Mg,Mn2+)(AsO4)3 · H2O
8.AC.10GroatiteNaCaMn2(PO4)(HPO4)2
8.AC.15BobfergusoniteNa2Mn5FeAl(PO4)6
8.AC.15Ferrowyllieite(Na,Ca,Mn)(Fe,Mn)(Fe,Fe,Mg)Al(PO4)3
8.AC.15QingheiiteNaMn3+Mg(Al,Fe3+)(PO4)3
8.AC.15Rosemaryite(Na,Ca,Mn)(Mn,Fe2+)(Fe3+,Mg)Al(PO4)3
8.AC.15Wyllieite(Na,Ca,Mn)(Mn,Fe)(Fe,Mg)Al(PO4)3
8.AC.15Ferrorosemaryite◻NaFe2+Fe3+Al(PO4)3
8.AC.15Qingheiite-(Fe2+)Na2Fe2+MgAl(PO4)3
8.AC.18ManitobaiteNa16Mn2+ 25Al8(PO4)30
8.AC.20MarićiteNaFe2+(PO4)
8.AC.25Berzeliite(NaCa2)Mg2(AsO4)3
8.AC.25ManganberzeliiteNaCa2Mn22+(AsO4)3
8.AC.25Palenzonaite(Ca,Na)3CaMn22+(VO4)3
8.AC.25SchäferiteCa2NaMg2(VO4)3
8.AC.30BrianiteNa2CaMg(PO4)2
8.AC.35Vitusite-(Ce)Na3(Ce,La,Nd)(PO4)2
8.AC.40Olgite(Sr,Ba)(Na,Sr,REE)2Na(PO4)2
8.AC.40Bario-olgite(Ba,Sr)(Na,Sr,REE)2Na(PO4)2 ·
8.AC.45StrontiowhitlockiteSr9Mg(PO4)6(HPO4)
8.AC.45WhitlockiteCa9Mg(PO4)6(HPO4)
8.AC.45MerrilliteCa9NaMg(PO4)7
8.AC.45TuiteCa3(PO4)2
8.AC.45FerromerrilliteCa9NaFe2+(PO4)7
8.AC.45BobdownsiteCa9Mg(PO4)6(PO3F)
8.AC.50Fillowite{Mn2+}{Na8}{Ca4Na4}{(Mn2+,Fe2+)43}(PO4)36
8.AC.50JohnsomervilleiteNa10Ca6Mg18Fe25(PO4)36
8.AC.50Galileiite{Fe2+}{Na8}{Fe42+Na4}{Fe432+}(PO4)36
8.AC.50Stornesite-(Y){(Y, Ca)}{Na62}{(Ca,Na)8}{(Mg,Fe2+)43}(PO4)36
8.AC.50XenophylliteNa4Fe72+(PO4)6
8.AC.55HarrisoniteCa(Fe2+,Mg)6(PO4)2(SiO4)2
8.AC.60KosnariteKZr2(PO4)3
8.AC.65Panethite(Na,Ca)2(Mg,Fe2+)2(PO4)2
8.AC.70StanfielditeCa4Mg5(PO4)6
8.AC.75RonneburgiteK2MnV4O12
8.AC.80Tillmannsite(Ag3Hg)(VO4,AsO4)
8.AC.85FilatoviteK(Al,Zn)2(As,Si)2O8
38.2.9.1Fillowite{Mn2+}{Na8}{Ca4Na4}{(Mn2+,Fe2+)43}(PO4)36
38.2.9.2JohnsomervilleiteNa10Ca6Mg18Fe25(PO4)36
38.2.9.4Galileiite{Fe2+}{Na8}{Fe42+Na4}{Fe432+}(PO4)36
38.2.9.5Stornesite-(Y){(Y, Ca)}{Na62}{(Ca,Na)8}{(Mg,Fe2+)43}(PO4)36
38.2.9.6XenophylliteNa4Fe72+(PO4)6

Other Names for Chladniite

Name in Other Languages:
German:Chladniit
Spanish:Chladniita

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Chladniite

Reference List:
American Mineralogist (1994): 79: 375-380.

Floss, C., 1999, Fe, Mg, Mn-bearing phosphates in the GRA 95209 meteorite: occurrences and mineral chemistry, American Mineralogist, v. 84, p. 1354-1359.

Rius, J. (2016): Terrestrial Chladniite Embedded In Polished Thin Sections Refined From Tts Microdiffraction Data. MISCA2016, MS6-OP2; http://forum.amiminerals.it/viewtopic.php?f=5&t=12854 (2016)

Internet Links for Chladniite

Localities for Chladniite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Antarctica
 
  • Eastern Antarctica
    • Transantarctic Mts
      • Wisconsin Range
AmMin 84:1354-1359
American Mineralogist, Volume 84, pages 1354–1359, 1999
USA (TL)
 
  • Texas
    • Hamilton Co.
      • Carlton
American Mineralogist, Volume 79, pages 375-380, 1994
Mineral and/or Locality  
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